When your check engine light comes on, it means your vehicle's onboard diagnostics system has detected a problem with the engine, emissions system, or related components that needs attention. This light can indicate a wide range of issues, from minor to serious, including:
- A loose or missing gas cap, which can cause fuel vapor leaks
- Malfunctioning oxygen sensors that affect fuel mixture and emissions
- Problems with the catalytic converter, which reduces harmful exhaust emissions
- Faulty spark plugs, ignition coils, or wiring issues that affect engine firing and performance
- Mass airflow sensor failures that disrupt air-fuel mixture calculations
- Transmission problems or cooling system issues that impact engine operation
- Fuel system problems such as clogged fuel filters or contaminated fuel
- Engine oil issues like low or dirty oil that can cause engine damage
The severity varies: a steady check engine light usually means a problem that should be checked soon but is not an emergency, while a flashing light signals a serious issue requiring immediate attention to avoid damage
. In summary, the check engine light is a warning that something under the hood needs diagnosis and repair. It is advisable to have a professional mechanic run diagnostic tests to identify the exact cause and fix it promptly to maintain vehicle safety and performance
